added a /save POST that saves a tmp file of the a workbook in user's tmp file directory

api/save/index.js

@@ -0,0 +1,44 @@
+const URL = require('url'), fs = require('fs');
+const do_wb = require('../../src/util');
+const formidable = require('formidable-serverless');
+const tmp = require('tmp');
+
+module.exports = function (req, res) {
+    res.setHeader('Access-Control-Allow-Origin', '*');
+    const url = URL.parse(req.url, true);
+
+    /* parse form data */
+    const form = formidable({ multiples: true, maxFileSize: 2 * 1024 * 1024 });
+
+    const newFile = () => {
+        const tmpobj = tmp.fileSync();
+        console.log('File: ', tmpobj.name);
+        console.log('Filedescriptor: ', tmpobj.fd);
+        return tmpobj.name;
+    }
+    const writeFile = (fileName, file) => {
+        // console.log(file);
+        fs.writeFileSync(fileName + '.xlsx', file, (err) => {
+            if (err) return res.status(500).send(err.message || err);
+        });
+    }
+    form.parse(req, (err, fields, files) => {
+        if (err) return res.status(400).send(err.message || err);
+        if (!url.query) url.query = fields;
+        ["N", "t"].forEach(k => { if (!url.query[k] && fields[k] != null) url.query[k] = fields[k]; });
+        
+        /* look for first uploaded file entry */
+        if (!files) return res.status(400).send("Missing file");
+        const fentries = Object.entries(files);
+        if (fentries.length == 0) return res.status(400).send("Missing file");
+
+        /* read file */
+        const file = fentries[0][1]; 
+       
+        fs.readFile(file.path, (err, body) => {
+            if (err) return res.status(500).send(err.message || err);
+            const tmpFile = newFile();
+            writeFile(tmpFile, body);
+        });
+    });
+};

api/server.js

@@ -2,6 +2,7 @@ const express = require('express');
 const app = express();
 const data = require('./data/index');
 const upload = require('./upload/index');
+const save = require('./save/index');
 const bodyParser = require('body-parser');
 const port = 3000;
 
@@ -12,6 +13,7 @@ app.use(express.static('public'));
 
 app.use('/api/data', data);
 app.use('/api/upload', upload);
+app.use('/api/save', save);
 
 app.listen(port, () => {
     console.log(`Listening on port: ${port}`);

package-lock.json

@@ -66,6 +66,11 @@
 			"resolved": "https://registry.npmjs.org/aws4/-/aws4-1.11.0.tgz",
 			"integrity": "sha512-xh1Rl34h6Fi1DC2WWKfxUTVqRsNnr6LsKz2+hfwDxQJWmrx8+c7ylaqBMcHfl1U1r2dsifOvKX3LQuLNZ+XSvA=="
 		},
+		"balanced-match": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+			"integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="
+		},
 		"bcrypt-pbkdf": {
 			"version": "1.0.2",
 			"resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
@@ -98,6 +103,15 @@
 				}
 			}
 		},
+		"brace-expansion": {
+			"version": "1.1.11",
+			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+			"integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+			"requires": {
+				"balanced-match": "^1.0.0",
+				"concat-map": "0.0.1"
+			}
+		},
 		"bytes": {
 			"version": "3.1.0",
 			"resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
@@ -147,6 +161,11 @@
 			"resolved": "https://registry.npmjs.org/commander/-/commander-2.17.1.tgz",
 			"integrity": "sha512-wPMUt6FnH2yzG95SA6mzjQOEKUU3aLaDEmzs1ti+1E9h+CsrZghRlqEM/EJ4KscsQVG8uNN4uVreUeT8+drlgg=="
 		},
+		"concat-map": {
+			"version": "0.0.1",
+			"resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+			"integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
+		},
 		"content-disposition": {
 			"version": "0.5.3",
 			"resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
@@ -387,6 +406,11 @@
 			"resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
 			"integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
 		},
+		"fs.realpath": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
+			"integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
+		},
 		"getpass": {
 			"version": "0.1.7",
 			"resolved": "https://registry.npmjs.org/getpass/-/getpass-0.1.7.tgz",
@@ -395,6 +419,19 @@
 				"assert-plus": "^1.0.0"
 			}
 		},
+		"glob": {
+			"version": "7.1.6",
+			"resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
+			"integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==",
+			"requires": {
+				"fs.realpath": "^1.0.0",
+				"inflight": "^1.0.4",
+				"inherits": "2",
+				"minimatch": "^3.0.4",
+				"once": "^1.3.0",
+				"path-is-absolute": "^1.0.0"
+			}
+		},
 		"har-schema": {
 			"version": "2.0.0",
 			"resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
@@ -439,6 +476,15 @@
 				"safer-buffer": ">= 2.1.2 < 3"
 			}
 		},
+		"inflight": {
+			"version": "1.0.6",
+			"resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
+			"integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
+			"requires": {
+				"once": "^1.3.0",
+				"wrappy": "1"
+			}
+		},
 		"inherits": {
 			"version": "2.0.3",
 			"resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
@@ -523,6 +569,14 @@
 				"mime-db": "1.47.0"
 			}
 		},
+		"minimatch": {
+			"version": "3.0.4",
+			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
+			"integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
+			"requires": {
+				"brace-expansion": "^1.1.7"
+			}
+		},
 		"ms": {
 			"version": "2.0.0",
 			"resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
@@ -546,11 +600,24 @@
 				"ee-first": "1.1.1"
 			}
 		},
+		"once": {
+			"version": "1.4.0",
+			"resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+			"integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+			"requires": {
+				"wrappy": "1"
+			}
+		},
 		"parseurl": {
 			"version": "1.3.3",
 			"resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
 			"integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ=="
 		},
+		"path-is-absolute": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+			"integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
+		},
 		"path-to-regexp": {
 			"version": "0.1.7",
 			"resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
@@ -633,6 +700,14 @@
 				"uuid": "^3.3.2"
 			}
 		},
+		"rimraf": {
+			"version": "3.0.2",
+			"resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
+			"integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
+			"requires": {
+				"glob": "^7.1.3"
+			}
+		},
 		"safe-buffer": {
 			"version": "5.2.1",
 			"resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -715,6 +790,14 @@
 			"resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
 			"integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
 		},
+		"tmp": {
+			"version": "0.2.1",
+			"resolved": "https://registry.npmjs.org/tmp/-/tmp-0.2.1.tgz",
+			"integrity": "sha512-76SUhtfqR2Ijn+xllcI5P1oyannHNHByD80W1q447gU3mp9G9PSpGdWmjUOHRDPiHYacIk66W7ubDTuPF3BEtQ==",
+			"requires": {
+				"rimraf": "^3.0.0"
+			}
+		},
 		"toidentifier": {
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
@@ -799,6 +882,11 @@
 			"resolved": "https://registry.npmjs.org/word/-/word-0.3.0.tgz",
 			"integrity": "sha512-OELeY0Q61OXpdUfTp+oweA/vtLVg5VDOXh+3he3PNzLGG/y0oylSOC1xRVj0+l4vQ3tj/bB1HVHv1ocXkQceFA=="
 		},
+		"wrappy": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+			"integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+		},
 		"xlsx": {
 			"version": "0.16.9",
 			"resolved": "https://registry.npmjs.org/xlsx/-/xlsx-0.16.9.tgz",

package.json

@@ -15,6 +15,7 @@
 		"express": "^4.17.1",
 		"formidable-serverless": "",
 		"request": "",
+		"tmp": "^0.2.1",
 		"xlsx": ""
 	},
 	"scripts": {

public/index.html

@@ -66,6 +66,11 @@ for(var i = 0; i < URLS.length; ++i) {
 
 <input type="submit" value="Click here to upload!">
 </form>
+<form method="POST" action="api/save" enctype="multipart/form-data"><input type="hidden" name="N" value="0">
+<label for="file">Upload a file</label>
+<input type="file" name="file" id="file">
+<input type="submit" value="Click here to save!">
+</form>
 
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